druid/processing
Gian Merlino 43488df975 Fix dimension selectors with extractionFns on missing columns. (#4717)
* Fix dimension selectors with extractionFns on missing columns.

This patch properly applies the requested extractionFn to missing columns.
It's important when the extractionFn maps null to something other than null.

* Extract helper method.

* Change contracts of VirtualColumns and VirtualColumn methods based on review comments.

* Remove unused import.

* Remove unused method.

* Adjust helper function.

* Adjustments
2017-08-25 18:34:42 -05:00
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